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BORROWED FUNDS - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Hedging basis adjustments $ 369 $ 693
Short-term borrowed funds 1,809 2,671
Available borrowing capacity 40,200  
Federal Home Loan Bank Advances and Letters of Credit | Secured Debt    
Debt Instrument [Line Items]    
Short-term borrowed funds 10,400 9,400
Federal Home Loan advances    
Debt Instrument [Line Items]    
Available borrowing capacity 7,400 8,000
Parent Company    
Debt Instrument [Line Items]    
Principal balance 2,300 2,300
Unamortized deferred issuance costs and/or discounts (5) (5)
Banking Subsidiaries    
Debt Instrument [Line Items]    
Principal balance 11,300 9,500
Unamortized deferred issuance costs and/or discounts (18) (19)
Hedging basis adjustments $ (91) $ (63)